【発明の名称】感震装置

Japanese Patent JP3137011

B2

PROBLEM TO BE SOLVED: To obtain an acceleration seismographic apparatus by which a vibration level can be detected with high accuracy by a method wherein an electric signal is applied to an acoustic-wave transmission and reception means by which an electric signal and a mechanical vibration are converted alternately and an electric signal from the acoustic-wave transmission and reception means is received so as to judge whether a danger exists or not. SOLUTION: A mechanical vibration is converted by piezoelectric buzzers 9, 10 into an electric signal by piezoelectric buzzers 13, 14, and a vibrating acceleration is detected by reception means 13, 14. Whether a vibration acceleration signal is less than a prescribed level or not is judged by a danger judgment means 17. When the signal is less than the prescribed level, the counting elapse time of a timer is reset to 0, and the reception standby time of the vibrating acceleration is set again. When the vibrating acceleration signal is at the prescribed level or higher, its observation elapse time is compared with a prescribed time corresponding to the vibrating acceleration. When the time is less than the prescribed time, it is judged that a danger does not exist, and the reception standby state of the vibrating acceleration is set again. When the time is at the prescribed time or higher, it is judged that a danger exists, and a danger signal is output. In this manner, a vibrating acceleration level can be judged by signals from the piezoelectric buzzers 9, 10, and the danger can be detected with better accuracy.

Yasuhiro Umekage
Kenzo Koji
Hideo Uematsu

JP32639196A

February 19, 2001

December 06, 1996

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Matsushita Electric Industrial Co., Ltd

G01H1/00; G01H11/08; G01V1/00; (IPC1-7): G01H11/08; G01H1/00; G01V1/00

JP280965A
JP877475A
JP8146843A

Fumio Iwahashi (2 others)

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